Problema de Carburação da Cryóton Yamaha

Hello friends, I wanted to ask you for a help and I have a Yamaha Cryton and from the tank a maguera that connects to the passage of gasoline and from there 2 hoses will come to the flange and another to the carburetor, well my problem is that the motorcycle mpezo to fail how to drown and I do not walk more now regulate valves and connect the hoses but start only if I take it out of the way Canceling it, because this problem can be